summaryrefslogtreecommitdiff
path: root/sound/soc/codecs/nau8825.c
diff options
context:
space:
mode:
authorJohn Hsu <KCHSU0@nuvoton.com>2016-11-11 07:16:29 +0300
committerMark Brown <broonie@kernel.org>2016-11-11 18:35:40 +0300
commitaee02c75a5fb3b3583780bb7b298cb0d0d6647e2 (patch)
tree63637d9709a9a5d9f8ed4d415765fa093d781fd9 /sound/soc/codecs/nau8825.c
parentd6d197458b5fc801b2274f5287a4df6ce74b230f (diff)
downloadlinux-aee02c75a5fb3b3583780bb7b298cb0d0d6647e2.tar.xz
ASoC: nau8825: FLL parameters finetune
The driver fine-tune some parameters to improve FLL performance. Those items have description as follow. (1)ICTRL_LATCH: FLL DSP speed capability control When FLL running at high frequency with long decimal number, DSP needs to operate at high speed. FLL DSP can optimize between performance and power consumption by ICTRL_LATCH.(111 has highest power consumption.) The default setting can be used to reduce power. (2)CUTOFF500: loop filter cutoff frequency at 500Khz It will give the best FLL performance but highest power consumption to enable the cutoff frequency. FLL Loop Filter enable to reduce FLL output noise, especially,(DCO frequency)/(FLL input reference frequency) is not a integer. (3)GAIN_ERR: FLL gain error correction threshold setting The threshold is comparison between DCO and target frequency. The value 1111 has the most sensitive threshold, that is, 1111 can have the most accurate DCO to target frequency. However, the gain error setting conditionally and inversely depends on FLL input reference clock rate. Higher FLL reference input frequency can only set lower gain error, such as 0000 for input reference from MCLK=12.288Mhz. On the other side, if FLL reference input is from Frame Sync, 48KHz, higher error gain can apply such as 1111. Signed-off-by: John Hsu <KCHSU0@nuvoton.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/codecs/nau8825.c')
-rw-r--r--sound/soc/codecs/nau8825.c48
1 files changed, 40 insertions, 8 deletions
diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
index 50cdb30297b4..3f9137f60c0d 100644
--- a/sound/soc/codecs/nau8825.c
+++ b/sound/soc/codecs/nau8825.c
@@ -1994,8 +1994,10 @@ static void nau8825_fll_apply(struct nau8825 *nau8825,
regmap_update_bits(nau8825->regmap, NAU8825_REG_CLK_DIVIDER,
NAU8825_CLK_SRC_MASK | NAU8825_CLK_MCLK_SRC_MASK,
NAU8825_CLK_SRC_MCLK | fll_param->mclk_src);
+ /* Make DSP operate at high speed for better performance. */
regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL1,
- NAU8825_FLL_RATIO_MASK, fll_param->ratio);
+ NAU8825_FLL_RATIO_MASK | NAU8825_ICTRL_LATCH_MASK,
+ fll_param->ratio | (0x6 << NAU8825_ICTRL_LATCH_SFT));
/* FLL 16-bit fractional input */
regmap_write(nau8825->regmap, NAU8825_REG_FLL2, fll_param->fll_frac);
/* FLL 10-bit integer input */
@@ -2011,19 +2013,22 @@ static void nau8825_fll_apply(struct nau8825 *nau8825,
regmap_update_bits(nau8825->regmap,
NAU8825_REG_FLL6, NAU8825_DCO_EN, 0);
if (fll_param->fll_frac) {
+ /* set FLL loop filter enable and cutoff frequency at 500Khz */
regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL5,
NAU8825_FLL_PDB_DAC_EN | NAU8825_FLL_LOOP_FTR_EN |
NAU8825_FLL_FTR_SW_MASK,
NAU8825_FLL_PDB_DAC_EN | NAU8825_FLL_LOOP_FTR_EN |
NAU8825_FLL_FTR_SW_FILTER);
regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL6,
- NAU8825_SDM_EN, NAU8825_SDM_EN);
+ NAU8825_SDM_EN | NAU8825_CUTOFF500,
+ NAU8825_SDM_EN | NAU8825_CUTOFF500);
} else {
+ /* disable FLL loop filter and cutoff frequency */
regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL5,
NAU8825_FLL_PDB_DAC_EN | NAU8825_FLL_LOOP_FTR_EN |
NAU8825_FLL_FTR_SW_MASK, NAU8825_FLL_FTR_SW_ACCU);
- regmap_update_bits(nau8825->regmap,
- NAU8825_REG_FLL6, NAU8825_SDM_EN, 0);
+ regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL6,
+ NAU8825_SDM_EN | NAU8825_CUTOFF500, 0);
}
}
@@ -2089,6 +2094,9 @@ static void nau8825_configure_mclk_as_sysclk(struct regmap *regmap)
NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_MCLK);
regmap_update_bits(regmap, NAU8825_REG_FLL6,
NAU8825_DCO_EN, 0);
+ /* Make DSP operate as default setting for power saving. */
+ regmap_update_bits(regmap, NAU8825_REG_FLL1,
+ NAU8825_ICTRL_LATCH_MASK, 0);
}
static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
@@ -2132,10 +2140,13 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
NAU8825_DCO_EN, NAU8825_DCO_EN);
regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER,
NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_VCO);
- /* Decrease the VCO frequency for power saving */
+ /* Decrease the VCO frequency and make DSP operate
+ * as default setting for power saving.
+ */
regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER,
NAU8825_CLK_MCLK_SRC_MASK, 0xf);
regmap_update_bits(regmap, NAU8825_REG_FLL1,
+ NAU8825_ICTRL_LATCH_MASK |
NAU8825_FLL_RATIO_MASK, 0x10);
regmap_update_bits(regmap, NAU8825_REG_FLL6,
NAU8825_SDM_EN, NAU8825_SDM_EN);
@@ -2159,8 +2170,13 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
* preparation halted until cross talk process finish.
*/
nau8825_sema_acquire(nau8825, 2 * HZ);
+ /* Higher FLL reference input frequency can only set lower
+ * gain error, such as 0000 for input reference from MCLK
+ * 12.288Mhz.
+ */
regmap_update_bits(regmap, NAU8825_REG_FLL3,
- NAU8825_FLL_CLK_SRC_MASK, NAU8825_FLL_CLK_SRC_MCLK);
+ NAU8825_FLL_CLK_SRC_MASK | NAU8825_GAIN_ERR_MASK,
+ NAU8825_FLL_CLK_SRC_MCLK | 0);
/* Release the semaphone. */
nau8825_sema_release(nau8825);
@@ -2176,8 +2192,16 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
* preparation halted until cross talk process finish.
*/
nau8825_sema_acquire(nau8825, 2 * HZ);
+ /* If FLL reference input is from low frequency source,
+ * higher error gain can apply such as 0xf which has
+ * the most sensitive gain error correction threshold,
+ * Therefore, FLL has the most accurate DCO to
+ * target frequency.
+ */
regmap_update_bits(regmap, NAU8825_REG_FLL3,
- NAU8825_FLL_CLK_SRC_MASK, NAU8825_FLL_CLK_SRC_BLK);
+ NAU8825_FLL_CLK_SRC_MASK | NAU8825_GAIN_ERR_MASK,
+ NAU8825_FLL_CLK_SRC_BLK |
+ (0xf << NAU8825_GAIN_ERR_SFT));
/* Release the semaphone. */
nau8825_sema_release(nau8825);
@@ -2194,8 +2218,16 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
* preparation halted until cross talk process finish.
*/
nau8825_sema_acquire(nau8825, 2 * HZ);
+ /* If FLL reference input is from low frequency source,
+ * higher error gain can apply such as 0xf which has
+ * the most sensitive gain error correction threshold,
+ * Therefore, FLL has the most accurate DCO to
+ * target frequency.
+ */
regmap_update_bits(regmap, NAU8825_REG_FLL3,
- NAU8825_FLL_CLK_SRC_MASK, NAU8825_FLL_CLK_SRC_FS);
+ NAU8825_FLL_CLK_SRC_MASK | NAU8825_GAIN_ERR_MASK,
+ NAU8825_FLL_CLK_SRC_FS |
+ (0xf << NAU8825_GAIN_ERR_SFT));
/* Release the semaphone. */
nau8825_sema_release(nau8825);